202 PROFESSOR FORBES ON THE TEMPERTAURE OP THE EARTH. 
at freezing for 1°. cent.,* or ‘000555 for 1° Fahr., a quantity one-tenth greater than 
its mean dilatation usually adopted. I accordingly had a Table constructed on 
this basis, with a double entry, one for the number of degrees, or space in the 
tube filled with the expanded liquid, and the other for the excess of temperature to 
which it is exposed. The arguments used for the two corrections, with this Table, 
were the following :— 
1st Argument. 2d Argument. 
Capacity in Degrees Degrees of Temperature 
to be corrected. to be corrected for 
5 7a+36 
1s¢ Correction (for Temperature of Stem), Table, p. 198. fees 3 aS 
2d Correction (for Temperature of Air), . T-/ Bie 
The sign of the correction is always opposite to that of the second argument. 
* Fecuner’s Repertorium, II, 430. The expansion of absolute alcohol is somewhat greater as 
given by MuNcKE, in a paper in the Petersburg Transactions, read 5th September 1834. 
a 
